which is the electron configuration for lithium?\no $1s^{2}$\no $2s^{3}$\no $1s^{2}2s^{1}$\no $1s^{1}2s^{2}$
which is the electron configuration for lithium?\no $1s^{2}$\no $2s^{3}$\no $1s^{2}2s^{1}$\no $1s^{1}2s^{2}$
Answer
Brief Explanations:
Lithium has an atomic number of 3, meaning it has 3 electrons. The first energy - level (1s) can hold 2 electrons, and the second energy - level (2s) can start filling after the 1s is full. So, the electron configuration is 1s²2s¹.
Answer:
1s²2s¹ (the third option)